CONTENTS. 



INTRODUCTION. 



1 



Adaptation of Food to Animals— Animal Manufacturers-Brigands- 

 Messmates-Mutualists— Theory of Spontaneous Generation 



CHAPTER I. 

 ANIMAL MESSMATES. 

 Definition— Free Messmates— Fixed Messmates 



CHAPTER II. 



FKEE MESSMATES. 



Fonnd in all Classes— Fierasfers in Holotliuridse— Pilot Fish— 

 Kemora-Crustacean Messmates-Poisoning by Mussels-Pearl 

 Mussel and small Crab-Dromic^-Turtle Crabs-Macrourous 

 Decapods-Hermit Crabs-Friendship of Pagurus and Anemone 

 —Isopods — Messmates on Whales — MoUuscan Messmates— 

 Lerneans — Distomes-Messmates of the Echinodermata— Of 

 Sponges— Infusorial Messmates 



CHAPTER III. 



IXED MESSMATES. 



Cirrhipedes-Importaiice of Embryology- Recurrent Development 

 —Messmates, characteristic of the various Species of Whales 

 — Cirrhipedes on Sharks — Crustaceans, Messmates on other 

 Crustaceans -Cirrhipedes on Molluscs — Bryozoa - Fossil 

 Messmates-Messmates on Sponges-Spicules of Hyalonema- 

 Ophiodendrum 



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